complex/ kɑːmpleks /

ETYM Latin complexus.
1. A conceptual whole made up of complicated and related parts; SYN. composite.
2. A compound described in terms of the central atom to which other atoms are bound or coordinated; SYN. coordination compound.
3. (Psychoanalysis) A combination of emotions and impulses that have been rejected from awareness but still influence a person's behavior.
In psychology, a group of ideas and feelings that have become repressed because they are distasteful to the person in whose mind they arose, but are still active in the depths of the person's unconscious mind, continuing to affect his or her life and actions, even though he or she is no longer fully aware of their existence. Typical examples include the Oedipus complex and the inferiority complex.